Apparatus eob



N'PEYERS. PHOTO-LITHOGRAPHER, wAsHxNGTON. D. C,

ERASTUS B. BIGELOW, OF BOSTON, MASSACHUSETTS.

APPARATUS FOR REGULATING THE TENS-ION OF WARP IN LOOMS.

Specification of Letters Patent No. 3,948, dated March 12, 1845.

To all 'whom t may concern Be it known that I, EnAs'rUs B. BIGELow, ofBoston, in the county of Suffolk and State of Massachusetts, haveinvented a new and useful improvement in regulating the tension of warpsand regulating their delivery from the bobbins in Brussels and otherfigured carpets and fabrics of a similar character and for otherpurposes where a uniform tension is required; and I do hereby declarethat the following is a full and exact description thereof, referencebeing had to the accompanying drawing, in which- Figure l, is a sideelevation of a loom frame with the improvement connected with it. Fig.2is a top plan. Fig. 3, is a section through the line A, B, of Fig. 2.

The nature of niy invention consists in suspending a weight on the yarnforward of the spool or bobbin, which is so arranged as to unwind theyarn at intervals as the slack is taken up by means of a catch whichholds the bobbin from turning till lifted by a weight.

The spools a, are arranged in a frame b, in the usual way and just infront of each spool two wires c, are fixed in the frame; the catch cl,is formed of wire the ends of which are attached to a thin plate e, theposition of which is over the wires c, above named and extending fromend to end of the spool.` The wire cl, curves downward at each end ofthe spool to a point f, just behind it where it is coiled around a pinforming the lfulcrum for it in the frame; from thence it is bent upwardand crosses over behind and parallel with the spool, and resting againstit; from the rim of the spool projects one or more pins It, that strikeagainst the wire (Z. This prevents the spool from turning to unwind theyarn. The yarn runs from the spool forward over the wire c, nearest tothe spool, and thence it passes down to the weight z', that is suspendedby it, and from that over the other wire c, to the shed; by this is willbe obvious, that as the slack yarn is taken up the weight will beraised, and when the yarn is let off from the spool it will fall and allthe time oontinue to keep the yarn stretched with an equal tension. Theweight consists of a ball or other shaped poise from which a rodprojects; about the middle of the length of this rod is a flattenedenlargement through which there is a hole, and from this a slot is cutdiagonally downward, thus forming a hook by which the weight is hungonto the yarn, and leaving a portion of the rod to project above it.When the slack of the yarn is used up as above named, and the weight israised, the upper end of the rod passes up between the wires c-strikesagainstthe plate above and raises it; this relieves the pin on the spoolfrom the catch and allows the spool to turn, which lets ofi yarn, andcauses the weight to descend, the catch being again brought into contactwith the spool stops its revolution as it comes around. The position ofthe weight in raising the catch is shown in No. 2 ofthe sectional fgure3. No. l, is represented with the weight down.

It will be obvious that the arrangement of the bobbins in the frame orcreelcan be varied as well as that of the catches, for instance, placingthem endwise toward the loom or vertical and so adapting the catches andweights as to act in that position without changing the generalprinciple.

What I claim as my invention and desire to secure Letters Patent is Thecombination of the weight and catch with the bobbin or spool constructedand arranged in the manner and for the purpose substantially as hereinset forth, so that when the weight is drawn up it will relieve thecatch, and allow the spool to unwind, and the weight to fall. y

E. B. BIGELOW.

Witnesses:

O. HAsTINGs, J. J. GREENOUGH.

